Machine for manufacturing sheet-metal elbows.



No. 844,411. PATENTED FEB. 19, 1907. A. G. SGHERER & o. w. MKEB. MACHINE FOR MANUFACTURING SHEET METAL ELBows.

.APPLICATION FILED SEPT. 29. 1904. n

5 SHEETS-SHEET 1.

No. 844,411. f PATBNTBD FBB.19,-19o7. -114 G. SGHBRBR are. W. MUKEE.

' l MACHINE FOR` MANUFACTURING SHEET METAL ELBOWS. APPLICATION FILED sBP'LzQ. 1904.

5 SHEETS-SHEET 2.

, ,Y EATENTED EEB. 19, 1907. A G. SGEEEEE A o. W. MUKEE. MAGHTNE EOE MANUFACTURING SHEET METAL ELBOWS.

APPLICATION FILED SEPT. 29, 1904.y

5 SHEETS-SHEET 8.

.-QQ A 3 Y" du l' l 16.844,411. f PATENTED EEB.19;A19`07. A. G. SGHEEER & o. w. vMOKEE. Y MACHINE EOE MANUFACTURING sEEET vMETAL ELBows.

APPLIOATION FILED. SEPT. 29, 1904.

PATENTBD PEB. 19, .19.07. A. G. SGHBRER & C. W. MUKBB. MAGHINBPOR MANUPAGTURINGSHEET METAL BLBoWs.-

No. 844,411.l

APPLICATION FILED SEPT. 29. `1904.

5 SHEETS-SHEET 6.

f Elbows, of which tially as disclosed spective view of the lever for UNITED STATES PATENT OFFICE.

ALBERT G. SOHERER AND CHARLES W. MCKEE, OF CHICAGO, ILLINOIS,

ASSIGNORS TO ARTHUR W. GLESSNER, OF GALENA, ILLINOIS.

MACHINE FOR.MANUFACTURING SHEET-METAL ELBQWS Specification. of Letters Patent.

Patenten Feb. 19, 1907.

applicati@ nea septmber 29, 1904. sarai No. 236,475.

Tou/U .whom it may concern:

Be it known that we, ALBERT ,G. SCHERER and CHARLEs W. MCKEE, citizens of the United States, residing atv Chicago, in the county of Cook and State of Illinois, have invented .certain new and useful Im rovements in Machines for Manufacturing heet-Metal the following is a specication. Y

' This invention relates to an improved machine for roducing corrugated stovepipe-elbows an the main object of the invention is to produce a machine in which after the blank l of the elbowI has first been madeinto a tube or cylinder said cylinder will be received, corrugated, and bent into an elbow, as will presently, appear.

0 attain these objects, the invention consists of a new and improved machine of this character embodying novel features of construction and combination of parts substanherein. In the accompanying drawings, Figure 1 is a side elevation of the complete machine. Fig. 2 is a top plan view of the complete machine'. Fig. 3 is a longitudinal central section of' the complete machine on line 3 3 of Fig. 2. Fig. 4 is a front elevation of the machine. Fi 5 is a erspective View showing the detail of the cliitch 9. Fig. 6 is a perspec'tive view of the mechanism adapted to -pperate the clutch 9 and throw the machine Fig. 7 is a peroperating the Fig. S is'a vertical sectional view of horn and the 1nto and out of operation.

s line. t e outer end of the barrel or head 14 with a broken-off section 'of pipe held therein. Fig. 9 'J a detail of a crimpingknife and the reciprocating arm for same. Fig, 10 `is a to plan view of Fig. 9, partially in section. ig 11 is a perspective view of head 30k.

Thenumeral 1 designates a base in which and upon which is mounted the improved machinery' for bending and corrugating the stovepipe-elbows. Bolted to the said base 1 l are t e vertical plates l and 1b. These plates are connected and secured rigidly together at the top of their sides by' the rods 1c and 1d. Power is applied through a belt or any known means to drive the wheel 2, mounted upon a shaft 3, which is journaled in' the boxings 4 and 5 and carries a small l gear 6, which meshes with a large gear' 7, Journaled upon a lower parallel shaft 8. The shaft 8 is journaled in the frame 1 at 1 and 1f and is adapted to be thrown into operative connection with the gear 7 by means of the clutch 9.

The clutch 9 is composed of the cylinder 9", revolving in the bearing 9b, attached to the frame 1 at 9". At 9 the cylinder is recessed to receive the clutch-dog 99, 'which is actuated by the spring 9f toward the hub 7 of the gear 7. The hu 7 is recessed at 7b to receive and engage the clutch-dog 9*. The clutch-dog 9e is beveled at 9U, so that when the piece Qhis drawn between the cylinder 9a and the hub 7 by means of the sprinfr 9i it strikes the bevel 9g and forces the clutc 1-do r out of engagement with the recess 7b an permits the gear 7 to rotate without rotating the shaft 8. The clutch 9 is adapted to be thrown into operation through the medium of the lever 10, the reciprocating rod- 11 and,

links 12. to the operator of the machine, and 4.

As will be clearly seen in Figs. 2 and 6, when the operating handle or lever .l0 is thrown to the right the machine is put in op eration through the withdrawal ol" the piece 9h from between the cylinder 9EL and the hub 7a and the engagement of the clutch-dog 9e .with the recess 7b. rl`he handle or lever 10 is engaged and retained against the action of the spring 9i by the lever-arm of catch 10b, which arm is actuated by the spring 10". The operation of the machine can be stopped at any time by manipulation ol the lever-arm of catch 10b, but it is also automatically sto ped when the operation of corrugating the e bow has been completed by means el" the bolt or projection 14a (clearly shown in Fig. 2) on the advancing head 14 contacting the leverarm of catch 10h to disengage it from the lever 10, which permits the s )ring 9i to draw the piece 9h between the cylinder 9fL and the hub 7"L and throwl the clutch out ol operation.

Upon the shaft S we mount a cam 15, which is adapted to reciprocate the lever 16, thereby imparting to the toothed spline 17 a `reclprocating motion.

As clearly shown in Fig. 7, the lever 16 is composed of two arms 16 and 16". These IOO two arms are journaled upon the bolt 16C, I strikes the spring-catch 25d, thereby releasv carried by the 4 bracket 1 6d, which said' bracket is bolted to the rear face of the vertical plate 1. The top end of the arm 16a is 5 connected with thev toothed spline 17 by means of the link 17".' The lower end of the arm 16` is provided with the lug 16". At the middle ortion of the arm 16 is the aperture 16'-, into which the lug 16 protrudes. The

1o set-screws 16lz are provided toadjust the latitude of play/to be allowed te the lug `1 6e. The lower endv of the arm 16h is provided with the lugf16?, which engages with the cam 15. By limiting and 'adjusting the play of the lug 16 i5 byvmeans of the set-screws 103g it is possible to regulate and chan rocation of the toot ed spline 17, thereby making it ossible to adjust the feed of the machine, t e amount of metal in each corruzo gation, and the number of corrugations in the elbow.

To the vertical plate 1a is hinged the barrel or vhorn 18 by means of the bolt or pin 18 passin through the bifurcated bracket 18",

z5 integra with and forming a part of the end 'of said barrel or horn 18, and the brackets 18, which are integral with and form a part` of the plate 1, This construction maintains the barrel or born 18 in a horizontal position,

3.0' but permits of a vertical `movement'of said barrel or horn 18 during the operation of cor ru ating to be described hereinafter. I ravelin on the barrel or horn 18, in which the toothe spline 17 slides, yis the head 14,

3 5 the rearward motion of said head bein' limited by means of the rods 20. As c early `shown in Figs. 3 and 8, 'the head 14 is pro'- vided with the annular shoulder 2,1, over which is driven the ring 22, thus leaving an 4o annular groove 23, in which to insert the end of the p1 e to be corrugated. The pipe is held in t e roove during the operation of corrugating y means of the pin A24, which isoperated throughthe lever 25, pivoted to the post 25 b means of the cam 25h, carried'u n the ower end of the lever-handle 25, w ich said handle is pivoted at a short distance above the cam 25 to one end of the lever 25. The head 14 also carries a block 5o 26, in which works a spring-actuated tooth or awl 26, the lower end of which 'engages the teeth of the toothed spline 17 and the upper end of which is provided with the tooth orpawl 26h. On the back of the lever-handle 25c is rovided a spring-catch 25d, so that when the landle 25 is pushed backwardly to release the crimped elbow -the spring-catch 25d engages the top pawl 26" off the pawl 2G,

When Ythe bundle 25c is brought forward to 6o again secure a fresh section of the pipe, the

'spring-catch 25 lilts the pawl 26 from engai-ement with the teeth of the toothed spline, permitting the bead 14 to be returned to its most rearward position. As the h ead.14

reaches this position the rod or proj ection 1g e the latitude of reciping the pawl 26, which falls into engagement with the teeth of thetoothed spline.

The pawl 26a`is retained firmly against the l teeth or' the toothed spline 17 ,and the head 14 upon the withdrawal of the pawl 26", as above set forth, is returned to its farthest rearward position by means of .the chain 27 and the weight 27, the said chain "being adapted toppass over the sprocket-wheel 27 b, journaled on the arm 27c v The crimping of the pipe is performedlby the plates or knives 28, (shown in Figs. 3, 4,

9, and 10,) which are carried upon one end of the arms 28, which are slidably mounted 1n the channels 28". The arms 28a are each provided with 'the pins 28C, which extend outwardly into their respective diagonal slots 29a, provlded in the circular plate 29. It is apparent that when the plate 29 is revolved the arms28 will be forced inward or out- `ward, according to the direction of revolution, by reason of the pins 28 gagement edges of the arms 28,a are beveled and reciprocate in the oppositely-beveledchannels 28h, provided in the face of the vertical plate 1b.

being in en- '1he diagonal slots 29 are so cut that when the pins 28, working in them, have spread the crimping knives or plates to their most extended position a certain additional circular yplay is permitted in which the crimping plates or knives are neither opening nor closing. During this time the pipe is moved forward by means of the spline and its auxiliary mechanism, heretofore described, to the proper position for the next succeeding corrugation.

The circular plate 29 is revolubly mounted upon the face of the vertical plate 1b by means of the brackets 29b and the Banged and unflanged roller 29C. The circular plate A29 is reciprocally revolved by means of the arm 29d, integral with or bolted to said plate 29 through the connecting-rod 29e, the lower 'end of w `ch is journaled upon the pin 29f,

set into tie face of the wheel or disk 29g.

The 'wheel or disk-29 is integral witlrthe shaft 29h, 'which carries upbn its other end the cog 29. The cog 29 meshes with the cog 29k, carried'by the shaft 8.

As will be seen in Fig. 3, the top plates or knives 28 are about one-eighth of an inch thick where the deep narrow corrugations of the throat of the elbow are formed. The plates gradually thicken toward the bottom, where they are' about ive-eighths of an inch thick where the broad shallow corrugations at the back of the elbow are formed. These plates are adapted to press the material of with the diagonal slots-29, The

IOC

izo

the pipe positively over the annular shoulder 18d to form the corrugations.

On the outward end of the barrel or horn 18 is mounted the'disk 18", having a slightly smaller diameter than the pipe to be corruthe depth of the broad shallow corrugations gated, the outer edge of which forms the shoulder 18d, heretofore referred to. face of the disk 18e is bolted the disk 18t by means of the bolts 18g passing through verin this ticallyelongated bolt-holes 18. manner the plate or disk 18" is vertically adjustable. beingabout one-quarter of an inch thick, and the bottom broadens out to 'a thickness of one-half of an inch. 'lhe disk 1S" is vertically adjusted upon the face of the disk 18e,

so 'that the bottom of the disk lfris above the annular shoulder 18d a distance equal to at the back of the elbow. ln the operation of corrugating all of the crimping knives or plates contract o'r are pushed toward the een-V ter equally; but when ,the broad bottom i plates 2b have accomplished the corrugating of the broad shallowcorrugations at the back of the elbow their continued action upon the broad lower edge of the disk lf elevates the entire pivoted barrel or horn 18 and in this manner assists in forming the deep narrow corrugations in the throatof the elbow already commenced by the contraction of the narrow top crimping or corrugating plates or knives.

For bending the elbow the following mechanism is provided: Upon the forward endof the shaftl 8 is mounted. the cam 30, into which projects the lug 30', carried by the piece 30h, the said plece 30h being reciprocated in the .boxing 3U by the revolution of the cam.

Upon the outer surface of the plate 1b and between the outer 4end of the piece 30b and the circular plate 29 are provided the brack ets 30d, in which is journaled the axle 30e, which has the arms'3()f integral therewith. Between the arms 30f the axle 30e is provided with a longitudinal depression or angular recess 30K. Pivoted upon said axle 3()e is the lever 30h, the lower free end of which comes opposite the outer end `of the reciprocating piece 30h. The upper end of the lever 30h is recessed through to the axle 30e and carries in said recess the spring-actuated catch 307 which engages with the angular recess 30K when the arms 3Uf are elevated, so that the motion of the reciprocating piece 30D causes the arms 30'to move toward the plate 1".

A head 30k,pprovided with the wings 30m, is placed upon one end of the tubular piece of metal to be corrugated. lhe other end of said tubular piecelis secured in the annular groove 23 of the head 14, and through this `-peration the head 14 is returned to its most rearward position bythe action of the weight 27, as heretofore described. This brings the lugs or wings 30m directly above the arms 3U", and when said arms are elevated to a point to cause the engagement of the spring-catch 8 0" with the recess 30g the arms and lugs are brought into 'operative proximity. 7l en the head 30k is thrown forward by the action` To the 'lhe top of the disk 1&4LA is narrow,

I1 of the reciprocatingr toothed spline and its mechanism, as heretofore explained, the J wings 30' contact and throw. forward tile arms 301'; hut the crimping operation-is taking place the cani 3U thi-rms forward the f piece 3o, which impinges upon the lever 30h, thus through the eaten 250i rotating 'the axle i 30e and throwing hack said arms 301' t0 the l same position theyl voccupied before being thrown forward. 1 This results in Vbending the elbow the proper amountat the same time the corrugations are being formed.

After the'pipe is made into an elbow the arms 3U" can be depressed in order to remove i the elbow by depressing the spring-catch 30. l From the foregoing description, taken in l connection with tue drawings, it will be seen that a section of stovepipe will be corrugated -l and bent to the form of an elbow automatically Aafter being inserted in the described machine. l l What we claim as new, and desire to secure l by Letters Patent, is

1 A machine for manufacturing sheet l metal elbows having corrugated means, feeding means and means for adjusting` the coaction of the `forementioned means to vary the number of corrugations in elbows of the same angle.

2. In a machine for manufacturing sheet- !I metal elbows, corrugating .means, receiving means, means for actuatingv the receiving' means to feed metal to the corrugating means and means for adjusting the latitude of motion imparted to the receiving means. v

i 3. In a machine for manufacturing sheetmetal elbows, lcorrugating mealis, .receiving means, means for actuating the receiving means' to feed metal to the corrugating means l and means for' adjusting the location and latitude of feed imparted to the receiving means. l 4. In a machine of this character, `the comf bination of a barrel, a spline mounted in said barrel, a receiving-head mounted on saidbarl rel, means for adj ustably connecting said l head with. said spline to move said hea, u on 4'said` barrel, corrugating means, lben ing l means and mechanism adapted to coaet with i the above-mentioned means to corrugate and benda 'stovepipa bination of means for receiving ,a cylindrical corrugations thereon and adjustable means for feeding the tube'to the corrugating means consisting of two members pivoted upon the same bearing one end of one of said members being in operative connection with the receiving means the other end of said member protruding into an aperture in the second member, said second member being provided with means for adjusting tl e size of said apen' ture and for engaging an operative cam.

ln a mac] lne of this character, the combin ation of a form for holding the section of 5. In a mae'. ine of this character, the'c'om-V tube, means for producing circumferential IOO IXO-

. pipe, adjustable means for limiting the 'in' rngating the ward movement of the pipe, a form for receiv ing the other end of the pipe, means for cori e, means forA engaging the last-mentioned) fp an elbow and automatic means or stopping the o erating mechanism.

7. n a machine of this character, the com bination of a barrel, corrugatmg means orm to bend the ipe to form adapted to pressthe metal of a section of pipe over the end of said barrel to form a corrugation and a plate adjustably attached to the Aend ot'l said barrel adapted to coact withV the corrugating means to produce deeper corru gations upon one. side of said pipe.

8. In a machine of this character, the com bination of a frame, a power-sh aft mounted therein, another shaft mounted in the frame, a clutch mechanism to cause the last-nientioned shaft to receive motion from the power-shaft, a barrel mounted in the upper ortion of the frame, a-spline mounted in the arrel., a cam, a lever connected with said cam and said spline to reciprocate saidspline, means slidably mountedupon said barrel to receive the ipe to be corrugated adapted to be thrown orward by the motion of said spline, means for limiting. the forward motion imparted by said spline, means carried by saidreceiving means to operate the clutch Yandstop the maclA ine, means adapted to engage theouter end of the pipe and mechanism for` coacting with said last-mentioned means to bend the pipe.

9. In a machine of this character, the combination of corrugatin 'i means, a barrelfor supporting themat-eria While subject to the action of the. corrugating means, a head slidably` mounted u on said barrel to receive .the

` material and ho d it in proper relation to the barrel and the corrugatin means, a spline slidably mounted in said arrel, means for reciprocating said spline, means carried by said head adapted'to engag." and receive .motion from said spline upon its forward stroke and means forpreventing said stroke from driving said head too far forward consisting of a Weight carried by a 'chain attached to said head and -running over a sprocket in a position' opposite to the direction of said stroke.

1 0. In a machine of the. character described, the combination of a frame, a poWer- Athe barrel, and adapted toreceive motion romsaid spline, to carry the material to be operated upon, a head adaptedto engage the, opposite endof the` material provided with oppositely-arranged lugs, a yoke provided with upwardly-projecting arms. for engaging the lugs, andan arm extending downwardly and operated uponby the other of said cams.

to .operate .the yoke-.and bendA the pipe.

11. In a machine of this character, ccm-11- gatinmeansincombinatiorrwithaverticallgr-` movazble barrel or horn Whereb certain` of the corrugating members, a r having formed the broad shallow corrugations-at theV back of the elbow, operate to press the barnelf carryin the pipe upwardv into a position- Where t e. other 'corrugating membersorm-` the dee cormgations necessary at the throat of an elA ow. v

12. Ina machine of this character,. the combination of means for holding a 'section `ol" pipe, means forv feeding the section forward and means for forming circumferential rug-ating-plates. each c Whichformsy a segcorrugations upon said ipeconsistingrof'cor.

ment of a circle, radiating arms carryingsaid plates, and means for radially reciprocatingsaid arms so that the plates are movedl to form a'corrugation.

13. In a machine of this character, cornigating means in combination with meansfon supporting the metal While subject to theac tion of the corrugating means adaptedftocov act with said corrugating means and to he moved therebytso as to present the metal unequally to the action of the corrugating' means. l

14.. In a machine of this; character, the combination of means for holding a section of pipe, means for feeding the section forward,

means forforming corrugations upon said section consisting of corrugatin -plateseach of which forms an are of a circ e, radiating arms carrying said plates, a each of said radiating arms an areciprocallyrevoluble member provided with oblique slots vinto which said pins project.

15. In a machine of this character, th combination of means for holding a section of pipe, means for feeding the section forward, means for forming corrugations upon said sectio'n consisting of corrugating-plates each .of which forms an arc of a'circle, radiating arms carrying said plates, means for radially reciprocating said arms so that said plates are moved to form a corrugation, and means coacting with said corr ugating means to bend the section.

16. In a machine of this character, in combination 1with crimping means, bending in carried by moans consisting of a lever-arm with means to vibrate same, one end ofsaid lever-arm being journaled upon and capable cf being thrown into operative connection Wit-han axle carrying other arms which engage lugs carried by a collar adapted to be attached to one end of the pipe to be corrugated.

y17. In a machine ofthis character, in combins-tion with corru ating means, means for holding'the pipe to e corrugated consisting v .sition consisting of a sprocket-chain attached ing thev play of .bination with means, means for holding a pipe while being of a collar having an annular groove vinto which to insert the pipe, a' pincapable of being projected into said annular groove after the pipe has been inserted to hold said pipe firmly in place, a lever for depressing said pin and a cam and handle for actuating said lever.

18. In a machine of this character, in combination with corrugating means, means for holding the pipe to be corrugated, means for feeding said pipe to 'the' crimping means, and means for automatically connecting and positively disconnecting said holding means and said feeding means consisting of a' springactuated tooth or pawl, a spring-catch carried by said holding means to engage said tooth or pawl` and positively disengage it from said feeding means, a rod carried upon the frame of the machine to contact with said spring-catchA to disengage it from said tooth or pawl and permit said tooth or paw] to return to engagement with said feeding means.

19. In a machine of this character, in combination wit crimping, means, means for holding a pipe while being corrugated, adjustable means for feeding said pipe tg;- said ccrrugating means consisting of ing toothed spline, an upper lever connected at its upper end with said reciprocating spline, said upper lever being journalcd at its middle portion and provided witha lug at its lower end, a lower arm journaled at its upper end upon the same bearing as carries the upper lever and havirg an aperture at its middle portion in which engages the lug carried by the upper lever, set-screws limitsaid lug in said aperture, a pin carried upon the arm and means for operatively engaging said pin.

20. In a machine of this character, in com corrugating means, feeding Kfor prf-3venting the forreturning the farthest rearward polower end of said lower l l l l l l sprocket located in the direction of the desired pull and a Weight attached to the other end of said sprocket-chain.

2l. In a machine of 'this character, the combination of corrugating means, feeding means, means for holding a section of pipe while being corrugated, means for preventing the section from being fed irregularly, and

means for actuating 'said holc ing means to return it to its upon being released from the feeding means.

22. IThe combination in a stovepipe-elbowmaking machine of meansfcr holding the section, means for feeding the section forward, a series of three or more corrugationformers adapted to form circumferential 'corrugations and means for bending the section and converging the corrugations thus formed.

In a machine of this character, corrugating means, means for 'supporting the metal while subject to the action of the corrugating means and adjustable means adapted to coact with the corrugating means to change the prcsentment of metal. to the corru'gating mean's. 4 i

24. In a stovepipe-clbow-maliing machine, a series of three cating corrugation formers creasing in width from one side of the elbow to the other.

25. In a stovepipe-elbow-making machine, a series of vthree or `more radially-reciprocating corrugating-formers gradually increasing in widthand means for converging the corrugations formed by said formers.-

26. The combination in a stovepipe-clbow machine of a .series of lcorrugation-formcrs operating to form corrugations gradually increasing in width and decreasing in depth and means for compressing the cep portions and converge the respective lcorrugations. A

In testimony whereof we aHix our signatures in presence of two witnesses.

" ALBERT G. SCIIERER.

CHARLES W. MGKEE.

McKee, of' Chicago, Illinois,

and that the said- Letters \\Patcnt the same may conform to the record Signed and 'sealed this 19th day of March, A. D., L90?.

l 'It 1s hereby certified that in Letters Patent No. 844,411, granted February 19, 1907, ZC upon the application of Albert G. Scherer and Charles W. y E l for an improvement in Machines for Manufacturing Sheet-MetalElbows, f occurs in the printed specification requiring correction, ats-follows: In line 90. page 3, nthe Word corrugated. should read corrugating; Gig-JJ l should be read with this correction therein that /l of the case in thePatent Oiiice. ...l

`Correction ln F. I. ALLEN,

farthest rearward positionl v .sition consisting of a sprocket-chain attached ing thev play of .bination with means, means for holding a pipe while being of a collar having an annular groove vinto which to insert the pipe, a' pincapable of being projected into said annular groove after the pipe has been inserted to hold said pipe firmly in place, a lever for depressing said pin and a cam and handle for actuating said lever.

18. In a machine of this character, in combination with corrugating means, means for holding the pipe to be corrugated, means for feeding said pipe to 'the' crimping means, and means for automatically connecting and positively disconnecting said holding means and said feeding means consisting of a' springactuated tooth or pawl, a spring-catch carried by said holding means to engage said tooth or pawl` and positively disengage it from said feeding means, a rod carried upon the frame of the machine to contact with said spring-catchA to disengage it from said tooth or pawl and permit said tooth or paw] to return to engagement with said feeding means.

19. In a machine of this character, in combination wit crimping, means, means for holding a pipe while being corrugated, adjustable means for feeding said pipe tg;- said ccrrugating means consisting of ing toothed spline, an upper lever connected at its upper end with said reciprocating spline, said upper lever being journalcd at its middle portion and provided witha lug at its lower end, a lower arm journaled at its upper end upon the same bearing as carries the upper lever and havirg an aperture at its middle portion in which engages the lug carried by the upper lever, set-screws limitsaid lug in said aperture, a pin carried upon the arm and means for operatively engaging said pin.

20. In a machine of this character, in com corrugating means, feeding Kfor prf-3venting the forreturning the farthest rearward polower end of said lower l l l l l l sprocket located in the direction of the desired pull and a Weight attached to the other end of said sprocket-chain.

2l. In a machine of 'this character, the combination of corrugating means, feeding means, means for holding a section of pipe while being corrugated, means for preventing the section from being fed irregularly, and

means for actuating 'said holc ing means to return it to its upon being released from the feeding means.

22. IThe combination in a stovepipe-elbowmaking machine of meansfcr holding the section, means for feeding the section forward, a series of three or more corrugationformers adapted to form circumferential 'corrugations and means for bending the section and converging the corrugations thus formed.

In a machine of this character, corrugating means, means for 'supporting the metal while subject to the action of the corrugating means and adjustable means adapted to coact with the corrugating means to change the prcsentment of metal. to the corru'gating mean's. 4 i

24. In a stovepipe-clbow-maliing machine, a series of three cating corrugation formers creasing in width from one side of the elbow to the other.

25. In a stovepipe-elbow-making machine, a series of vthree or `more radially-reciprocating corrugating-formers gradually increasing in widthand means for converging the corrugations formed by said formers.-

26. The combination in a stovepipe-clbow machine of a .series of lcorrugation-formcrs operating to form corrugations gradually increasing in width and decreasing in depth and means for compressing the cep portions and converge the respective lcorrugations. A

In testimony whereof we aHix our signatures in presence of two witnesses.

" ALBERT G. SCIIERER.

CHARLES W. MGKEE.

McKee, of' Chicago, Illinois,

and that the said- Letters \\Patcnt the same may conform to the record Signed and 'sealed this 19th day of March, A. D., L90?.

l 'It 1s hereby certified that in Letters Patent No. 844,411, granted February 19, 1907, ZC upon the application of Albert G. Scherer and Charles W. y E l for an improvement in Machines for Manufacturing Sheet-MetalElbows, f occurs in the printed specification requiring correction, ats-follows: In line 90. page 3, nthe Word corrugated. should read corrugating; Gig-JJ l should be read with this correction therein that /l of the case in thePatent Oiiice. ...l

`Correction ln F. I. ALLEN,

farthest rearward positionl in Letters Pate Correction the word It is hereby certified that in Letters Piment No. 844,411, granted February 197 i907,

upon the application ofAlberL G. Scherer and Charles W. McKee. of (illiicago. Illinois, for an improvement in Machines for lifafnullct'ui'ing SlicehMctzil Elbows," zul err-0r occursI in the printed specification requiring correction, :Ls follows: 1x1 line 9U, page 3,

corrugated should rend mrruyazfng; and that, the said Letters lliitunt; should be read with this: correction {,Alierein tlm! Llic Hume may cmifmm tu the i'i-cor'd Putcnt (.)fllma Signed and sealed this 151th day Yi' Miu-ali, AA D., i007.

[SEA L] If.

ol" tin: case in the 1. ALLEN. 

